Granted Patent
Utility
US 4,135,947 · App. 05/789,925
Method of cleaning surfaces with CO.sub.2 -neutralized amine compositions
Inventor:
Donald R. Rink
Patented Case
View Patent ↗
Granted: Jan 23, 1979
Filed: Apr 22, 1977
Inventor
Donald R. Rink
Assignee (at issue)
Union Carbide Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.